1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/kernel.h> 3 #include <linux/errno.h> 4 #include <linux/fs.h> 5 #include <linux/file.h> 6 #include <linux/io_uring.h> 7 8 #include <uapi/linux/io_uring.h> 9 10 #include "io_uring.h" 11 #include "rsrc.h" 12 #include "nop.h" 13 14 struct io_nop { 15 struct file *file; 16 int result; 17 int fd; 18 unsigned int flags; 19 __u64 extra1; 20 __u64 extra2; 21 }; 22 23 #define NOP_FLAGS (IORING_NOP_INJECT_RESULT | IORING_NOP_FIXED_FILE | \ 24 IORING_NOP_FIXED_BUFFER | IORING_NOP_FILE | \ 25 IORING_NOP_TW | IORING_NOP_CQE32) 26 27 int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 28 { 29 struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop); 30 31 nop->flags = READ_ONCE(sqe->nop_flags); 32 if (nop->flags & ~NOP_FLAGS) 33 return -EINVAL; 34 35 if (nop->flags & IORING_NOP_INJECT_RESULT) 36 nop->result = READ_ONCE(sqe->len); 37 else 38 nop->result = 0; 39 if (nop->flags & IORING_NOP_FILE) 40 nop->fd = READ_ONCE(sqe->fd); 41 else 42 nop->fd = -1; 43 if (nop->flags & IORING_NOP_FIXED_FILE) 44 req->flags |= REQ_F_FIXED_FILE; 45 if (nop->flags & IORING_NOP_FIXED_BUFFER) 46 req->buf_index = READ_ONCE(sqe->buf_index); 47 if (nop->flags & IORING_NOP_CQE32) { 48 struct io_ring_ctx *ctx = req->ctx; 49 50 if (!(ctx->flags & (IORING_SETUP_CQE32|IORING_SETUP_CQE_MIXED))) 51 return -EINVAL; 52 nop->extra1 = READ_ONCE(sqe->off); 53 nop->extra2 = READ_ONCE(sqe->addr); 54 } 55 return 0; 56 } 57 58 int io_nop(struct io_kiocb *req, unsigned int issue_flags) 59 { 60 struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop); 61 int ret = nop->result; 62 63 if (nop->flags & IORING_NOP_FILE) { 64 if (req->flags & REQ_F_FIXED_FILE) 65 req->file = io_file_get_fixed(req, nop->fd, issue_flags); 66 else 67 req->file = io_file_get_normal(req, nop->fd); 68 if (!req->file) { 69 ret = -EBADF; 70 goto done; 71 } 72 } 73 if (nop->flags & IORING_NOP_FIXED_BUFFER) { 74 if (!io_find_buf_node(req, issue_flags)) 75 ret = -EFAULT; 76 } 77 done: 78 if (ret < 0) 79 req_set_fail(req); 80 if (nop->flags & IORING_NOP_CQE32) 81 io_req_set_res32(req, ret, 0, nop->extra1, nop->extra2); 82 else 83 io_req_set_res(req, ret, 0); 84 if (nop->flags & IORING_NOP_TW) { 85 req->io_task_work.func = io_req_task_complete; 86 io_req_task_work_add(req); 87 return IOU_ISSUE_SKIP_COMPLETE; 88 } 89 return IOU_COMPLETE; 90 } 91